Question # 1

Benzene has pi electron

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2

4

6

8

The composition mixture of clay and lime stone in a raw material is:

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75% limestone & 25% clay

15% limestone & 55% clay

25 limestone & 75% clay

55% limestone & 15% clay

Property due to which water acts as a universal solvent is

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Polarity

It's ability to make hydrogen bond

Both A and B

Strong dipole dipole interaction

Most reactive among the following

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Li

Mg

Ca

Na

In order to determine ∆H (latt) of ionic compound which is correct relationship

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∆H latt. = ∆Hf - ∆Hx

∆H latt. = ∆Ha + ∆Hv

∆H latt. = ∆Hf + ∆Hx

∆H latt. = ∆Hf - ∆H sol.

For a chemical reaction in which one of the reactant also act as solvent, the order will be

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First order

Third order

Second order

pseudo-first order

Elements of II-A group are called alkaline earth metals due to the reason that

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they occur in earth only

they form divalent cations only

they have ns2 electronic configuration

their oxides and hydroxides are alkaline in nature and metals are present in earth crust

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called

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Fibre

Plastic

Varnish

Polyamide resin

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

Which of the following test is not given by aldehvde

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2. 4 DNPH test

NaHSO3 test

Tollen's test

Sodium nitroprusside test

The strongest conjugate base is

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OH-

CH3O-

C6H5O-

CH3COO-

In azeotropic mixture showing negative deviation form Raoult's law show

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Higher b.p. than either

Lower b.p. than either

No change in b.p.

None of these

Identify the compound formed, when ethylene combines with water in the presence of 10% sulphuric acid and HgSO₄as catalyst

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Carbinol

Methanol

Ethanol

Glycol

The bond length b/w atoms of hydrogen in the hydrogen molecules is:

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7.54 nm.

0.0754 nm.

0.754 nm.

0.00754 nm.

Synthetic rubber is made by polymerization of

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Chloroform

Acetylene

Divinlacetylene

Butene

The Mn³⁺has ______ color

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Violet

Green

Red/brown

No color

In exothermic reversible reaction increase in temperature shift the equilibrium to :

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Remains unchanged.

Product side.

Reactant side.

None of above.

The ore CaSO₄2H₂O has the general name

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Gypsum

Dolomite

Calcite

Epsom salt

Detergents are

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Synthetic products

Natural products

Both (a) and (b)

None of these

The symbol of the element whose atoms have the outer most electronic configuration 2s²2p³is

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N

Li

P

Na

Which of the following acts as ligand

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NH₃

NH₂-- CH₂-- CH₂-- NH₂

C₂O^2-₄

All these

An electric current is passed through silver voltameter connected to a water voltmeter. The cathode of the silver voltameter is 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is

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56 cm³

550 cm³

5.6 cm³

11.2 cm³

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